Shadow Weaver breaks into the home of the retired wizard Callus, and steals his magical mirror which can transport people from different worlds to Etheria. Hordak uses the mirror to transport Prince Adam to his dungeons, in the hope that Adora will come to rescue her brother and he will be able to recapture her. As Callus enlists the help of Bow and Glimmer to recover his mirror, She-Ra sets out to rescue Prince Adam, before Hordak can cause more havoc with the mirror. (thetvdb.com)